ptp: check that rsv field is zero in struct ptp_sys_offset_extended
Otherwise it is impossible to use it for something else, as it will break userspace that puts garbage there. The same check should be done in other structures, but the fact that data in reserved fields is ignored is already part of the kernel ABI. Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -224,7 +224,8 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
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extoff = NULL;
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extoff = NULL;
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break;
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break;
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}
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}
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if (extoff->n_samples > PTP_MAX_SAMPLES) {
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if (extoff->n_samples > PTP_MAX_SAMPLES
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|| extoff->rsv[0] || extoff->rsv[1] || extoff->rsv[2]) {
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err = -EINVAL;
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err = -EINVAL;
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break;
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break;
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}
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}
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